Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbce36a7d50ada3242c4cd7d779c61491183383c9adee1c4b0e3f31743ef58ee' 
  AND token = 'kmCa93ABr0k8yrf6FYQBRn69rjaz7hw+NDlxb3HBJ3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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