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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc6c3c706b2b8b68c83b99ace99f1d01f752a4d0d2e9cb1c891a3ec61fc4522c' 
  AND token = 'wNrfHDhDox5bTmLQ7aT7S3RKqm1bQkqXc0EHXNAJtqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}