Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45faf448bf0575deec681812e1e0a81aeeebdbf0d2fe3350599a281e54abffb8' 
  AND token = 'tMQPQiVOy8Fex6TiibhuI5c7im8l6nZVdG1WtJn5Qv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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