Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f5ab8967ac9ce51f6dc1bf6b5ae66157129e7eda6b5c9b86aca1e493a365af' 
  AND token = 'oL0IkceZhMDn+P5JRTt244nHtm5Bx+ZYMoV1WX4GYiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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