Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1b5c5a89fc33b9d4c7d9109a24880c2012501b4a6659b6e1e0b5e7f596b9f6' 
  AND token = 'eK7QwpWHbOG1agqRieGCv/ZqU2TUnLhZMb2631aZ82U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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