Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fde1eac39905654f82ad07d0306840fbe85d992e922f452da6f16055a69a8fff' 
  AND token = 'kFkOfnXZQ6scakc3yXMeHezfxzhFV9eWEFaFhnSsaaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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