Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2300d8fa446b85c2275d0d4740ed7af16cb8da665deb6a420fafcbaaf99b76' 
  AND token = 'TB4QpYnjBKwyJ1lQ/yKHlusH2a4t0SpqcDW6W6S8FyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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