Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4f8d6cc50d2aebe077b1201d4326c33faa5e7232a61c21fec5d76d8c70ba0e' 
  AND token = 'Ee1hDHEMVh82zFwzu/xzoaWtOp52BM4M2ciLi3UmRpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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