Should I consider my conference paper as published, if fee is paid but I didn't attend the conference?
If the proceedings have been published and your paper is included (and usually at this time it is included), your paper is published.

Check the proceedings.

Is this kind of link of the conference that you need: index of proceedings

I think it will be published later. At this point if nobody presented your paper at the conference, it has to be considered public after inclusion in the proceedings only, so you need to have evidence of such proceedings publication.