Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8265aaa9f041bb804f9325eebc8c5445019032ce4f19cf27b26a9f1659c612cb' 
  AND token = 'd8W2zJ6nibwDexHYG07ZJ5DC2fRjckfp1RWer7vLtbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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