It will not survive long. The voltage rating is an indication of the gap between the contacts. At 80VAC, it may arc before you press it, or it may continue to conduct through the plasma when released. Both will wear down the switch, and eventually it will increase in resistance or fuse closed.
As pointed out by JRE, you're counting the 8mA coming through the 10K load, but not the current through the coil. That will probably be higher, and in its current configuration with no flyback diode, it will certainly result in voltage spikes even higher than 80V. These will be even more destructive than the 8mA arc.
In this schematic, it's unclear why you're using the relay at all, since the power to the 10K load would be the same if you eliminated the relay and attached it directly to your 80V. Unless you're really using the NC contact, in which case the 10K load never gets power, except for briefly between the time the switch closes and the relay opens.
This switch, however, still will not work. :-( You're better off finding a high-voltage device with a switching threshold that your switch can handle, and use the switch to turn the HV device on and off.