Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e43fa8a81822fe5227aa6be3839274d91cdc9c376d652ff7dad04574659b03c' 
  AND token = 'vleXx0BgXlcHkwOyUgKFqLr6RRvekXdu8L9icULVVos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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