How to Index Article URL Instantly in Google?

there is some option for indexing :
Go at Google Search Console and fetch your URL
URL share on Social media with description
Submit at Classified ads
Local Business listing sites Justdail, IndiaMart Nextbizdoor etc...

Use webmaster
Google indexes “real” sites regularly – if you’re a white hat SEO this isn’t something you need to worry about.

Google url submission box is removed so you can try using "Fetch as Google" and request for indexing. Once it is done, submit your sitemap and wait for some time.

Yes, Go to webmaster tools. then click on add your property, Then goto Crawl/Sitemaps and select ADD/TEST SITEMAP.
Finally add your url and google will added it Instantly.

Here are some short tips Which Im using and works perfectly:

Write Unique SEO optimized content
Use heading tags and Keyword
Backlinks
Article directory submission
Submit blog to Web directories

Submit article link to webmaster to fetch.

If you want to index your article url in search engine then go to Search console and then click on fetch as Google. Enter your url and then click on fetch. It will help in crawling and indexing of the url.

You can use any social bookmark sites as well.

To Index Article URL Instantly in Google.
1) Go to Google Webmaster tool website
2) Add your property
3) Then goto Crawl/Sitemaps and select ADD/TEST SITEMAP
4) add your url and google will added it Instantly.

In google webmaster tools use fetch as google your article index instantly

Google Webmaster - Fetch as google is best option.

Search engines submission and ping is one of the best option

To Index Article URL Instantly in Google.
1) Go to Google Webmaster tool website
2) Add your property
3) Then goto Crawl/Sitemaps and select ADD/TEST SITEMAP
4) add your url and google will added it Instantly.

The fastest way to get articles indexed is to use rpc ping services like Ping-o-Matic and Feed Shark that let Google Blogs and other Blog Search engines know within minutes of new content on your blog. In Wordpress, you can set and forget this service with several like FeedBurner already set up for you. Unlike search submissions you get indexed in minutes instead of days and can be ranking for your keywords in days instead of weeks.

Write article on medium,,,,,,,,it's very fast indexing sitte,,,

Either you can use below link to submit URL to Google. You can make your choices out of the options.
Freewebsubmission.com

Write article on Quora, pinterest and other article submission sites

in that case, you can share web link everywhere i.e. Quora, facebook, Pinterest, Tumblr.

But i don't have webmaster access of that website

You need to get this done using search console.