Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807aaa34ce8d1a2e1b95708f700c401b8f08eb5f4a53609556db8f2da844f2a3' 
  AND token = 'O/oFpWpBxrpduS+3jgHTQzaXaovVr1RfoNb5h9Q8eLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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