Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a556e39809a5ef7a43d1096e2926a8129999382bc8d7fb8a58d8541790d89cd' 
  AND token = 'NTK9cKcl5NEu8XushMUQEKD7kkN1pxHgh0nmHTDoP7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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