Right now it's impossible to query for a specific document without the use of ID.
Unless you have the ID you are risking getting multiple results, for instance if the file name is not unique.
Please add the use of Url in the condition for the SharePoint Online query a list action.
Thank you very much for posting your feedback for our review. At this time, we will not be adding this request to the near-term backlog, as we are focused on other highly requested features. However, we reevaluate requests every quarter and will reach out if priorities change. Please keep the feedback coming as it is critical for our longer-term planning.