Having an exact match domain will have some positive effects but the site will need to have quality content, good on page seo, high quality and relevant backlinks with good link diversity as well as a good social media presence on various platform. Do yourself a favour and check out some of Brian Deans Seo stuff... he offers a nice FREE, simple PDF roadmap for getting a site ranked and what SEO guidelines you should follow.
If you grab an .online domain let say it's blackshoes.onlone and you want to rank for something like " black shoes online" then yes, Google will take the right side of the dot into consideration.