Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c021a575815fc0a17d37774b0764f1e0f334b3d7744616cda8bc006e3f8cec' 
  AND token = 'LwCvEt5GF1nVJeB+ojgK8ai7QjIisLRY3wohFZx7Als=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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