Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b6af35890ee58ad7ac47c259cac0ccc1fd65de296f410dcafa1d90598d4cea' 
  AND token = 'C3oiKjeWEwk4Zcny5TS8dYb0Ivwm2xOjBD4xRlkX0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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