Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fb455dea1a2d312896859545cd95f565a28b6ab259e5e6b90f5b3d8bc622d2ba' 
  AND token = 'TErm1RQzv9jYye0NSvxgB8x1D6ZXd2dTKrfbNcA8HrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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