This is the kind of mistake you can encounter after clicking the link in any kind of confirmation emails from HitBTC. For example, withdrawal confirmation email.
The explanation is simple: the link got expired. Every confirmation email has a limited lifespan. For example, withdrawal confirmation link is active only for one hour. In case you click the expired link, you're about to see the "Invalid token" error.
Just try to initiate another withdrawal, or whatever action you've been planning to confirm via email.