Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3dd723412808f0d030d61a5dea1ad7ab3df834b405fc453c6d3489e5e7b975' 
  AND token = 'hjwcriLNd3KetCPH3YtluyVxqyE+hFjph1i+m1IIy+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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