You can renew the token in several ways, but one of the easiest is via https://build.particle.io.
At the bottom left, you’ll see a gears symbol and there you’ll find a button to reset your token.
Do you remember, if you ever did a CC3000 update (or deep_update)?
What colors does your Core show during factory reset?
Or your cloud key might be broken (see second link).
But you might also find some useful hints in topics with similar symptoms, like
3 red LEDs cloud failure?
Red LED blinks three times when trying to connect to the wifi network
BTW: If you read about commands like spark keys ..., this refers to the so called CLI tool, which is now particle keys ... and installation instructions can be found in the docs.