Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2d3bff12ff689fbf9a7214ad88dd8d7f96e0cac8c7ddf47ee05aacdb62aca3' 
  AND token = 'pUiVreAXUotytEEpjyzIgsgJbV27oGscBdfweyJ2ATI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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