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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def check_token(self, token: 'RedisEphemeralTokens') -> bool: """ Check that a token is correct for a given scope token. """

        if self.get_state() is None:  # Token expired
            return False

        correct_token = self.make_token(self)
        self.clear()
        return constant_time_compare(correct_token, token)