If you reach a quota/rate limit on an API call then the returned status code will indicate that, normally with something like 429. Take a look at the HTTP response headers and status code. This tends to provide the answers.
We don't have insight into your call records but the next step is to assume that your query is filtering everything out so simplify your filter and confirm you're getting any records back. If you don't get any records back with no filtering then something is wrong. Most likely your filter is eliminating all the records.