Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259d19679e4b357a0bb05809f0371f0bc14795a36c6c7ac1c5e0f83ee663a1e4' 
  AND token = 'Qe2c4qV+bVQDbHhBCtrP27ZfVtZGok9kXje1R98FrmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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