Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80df77afc25cfeef200fab38b5ab964073b15ff74d9a2d48b51a757a2d0ac017' 
  AND token = 'LUDyPnHZZERIfRCOIieeD7j782DCA52LiKMfyzQdq3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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