Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad31cb3c2e1626b3c5f09106add31cfd717458a55c999d01e4b7e05799fc351f' 
  AND token = 'XJswkND4ELEjjA14/g4wUr9Aa+idiIAFrTppXM1Y0z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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