"Can I move to quash the service as too late?" -- No, assuming you have no other basis to quash service of the summons. The proper motion, if served more than 3 years after issuance, is a motion to dismiss pursuant to C.C.P. section 583.250(a).
The 60 day deadline imposed by CA Rules of Court 3.110 applies to filing the proof of service with the court. It is imposed to move the case along. Unless the court has dismissed the case (and therefore the case is no longer pending) pursuant to that rule, you must file a timely appropriate responsive pleading.
You should be able to verify the case status from the court's website. I advise you to consult local counsel ASAP so that your responsive pleading can be timely filed. Good luck.
The C.C.P. sections regarding service of summons, etc., are here: http://www.leginfo.ca.gov/cgi-bin/displaycode?section=ccp&group=00001-01000&file=583.210-583.250
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