Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6817b4796c4ddbb2a60454d06e5220dd4f1f96ed45a1e1b24a471bd5868b1e' 
  AND token = 'Eq1wja+KDpvuhzQIzisTuMZrT68BmyD28LUdtvzoMLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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