Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3196efaf54aa5954e864268fedfc1c5e4b6d153620e635a286e2576bb78edf3' 
  AND token = 'CbEcpJwHMR0pT+j2UOrLqDZaw2NSBj0nPKqc0BSRRDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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