Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecfdb772716f1c5a4e69afee3d9e874a97931a22ca0c586e7042d2ca921acb4' 
  AND token = 'BhNRg9LZqDsDbaHEhQcmNr060UHI275cEt0WHhU7kXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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