Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a573d6b1e8ab31c42ccf095126cfc0159cf2ba3c215c3b5700a3dae29cf04d06' 
  AND token = 'PwLfpTdfSqhudfzRTOmmKPvebxTK74Hoqcae5mUAVPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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