Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef1b751aee600e56bcb57c7fa6d23a29cd0fa87912d6c2d410270b97235b8e56' 
  AND token = 'XdS5XdbFpk2UbnZCTKno8CjE/k40koZZmocCBgIu7Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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