Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8211cd7f80a18a1cf734b411b45678090d3379441159c5ef138c9534f182696d' 
  AND token = 'j1pyTjl1FJxNpdQkH6y41BGiWgiQ5TbIA9+JehrZ6cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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