Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a747620f02005ab62716d64be84612ea0c3698859da43b8a7d74276b54811b42' 
  AND token = '7q6/2eFmmQgg+7KcvAivB1jjoSoo9mAt2ovZvgFVHeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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