Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21230ffabb9247ff5d8cd6955319ac529214738d5344e553ac4a456f2fed5a11' 
  AND token = 'kgZpmOS4zoXdPQWqEn7Oi6+uN3ppcwAvXytQ59o+jEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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