Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a912b19712e05e159bf52d621fe4cd2d202b69c887b41be1c269d0cd575d5fba' 
  AND token = 'iFooVx0slY4lOaIICbvEn8iY7UywnudfHpDrPzvPPQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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