Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a9cb69ded1118e8b8bdf9ed7f63ffb82f59558a4fc1b91a11def092ad5fc0251' 
  AND token = 'Ngo7nbP3ebbj1tXS+MyiOYHpKop7Mx3H2j1zOyOX1uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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