Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '832e6a68ab42c965f9f6cade7d9ed698896b04f938f8e46fdbe0bc42fd2bbb07' 
  AND token = 'uelTQK/DARh2ol9BT05SKRbFokvYzcsM240yjbYRzaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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