Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4de43e09f80b9df42fa95e207b95e255ace13fa0c85d5e8b3a6155baa430199' 
  AND token = 'dmgZROcVD6LcK/ULYVa8itdMFTFwIMbZ2esZVrvV8/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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