Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9529b103dbc8b49401044122ffeba0dd3c3429a931816cec7b7699da56c05d60' 
  AND token = 'ZUBtcMyHmc2k3Ndj+NuzbHSCwu7fMjOWQR20YcFNYq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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