Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e563887f3245dffd6d6b98585d9d3f556e649dab2f7921d0adf728e698e409db' 
  AND token = 'VYKx9bXje9R+gQCzKA0EdTvccQ23tmIPFbpWtx1MF7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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