Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2497dc18cae54724abe027bf2cd24977697f2d5ff0a99810df344785007bd353' 
  AND token = '3UysAP7zY+Udu5/BuoJ+1wrcJRaJMbO/N/EXO1lIfD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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