Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83acc194e97cae9ea59be0382867c28dd55ce8120004d0b2aa649a1d2d4cfeab' 
  AND token = 'k6Rw3hb/UKeW9ohjXaqprucJ3Ev/+ZdP/SzwkirVS5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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