Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a322b7cd5adc732e2e9d68c2d31245fbe37df7c6ae0b76b43fa3f9b1b5fe9849' 
  AND token = 'TFslENiAO1a3sLCpSSGtOUcI8JXDLWMuzZ54KOFOUuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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