If I put your query URL into the public Twitter search page search.twitter.com I get no results.
Using it in the API, I also get no results.
Therefore there is a good chance that it has not been shared within the last 7 days (the scope of the Search API), otherwise you would have a result set of statuses containing the URL.
For example, here's a search I tried containing a different URL, which worked.
fun fact - searching just for
themarketmogul.com does return a number of results. You'd have to check which t.co link in the result set actually resolved to your target URL though, and then count those.