Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c2fdee9e0813566eab5c3ff969d078a56c2ef104a2e16e1aef2c9dbfca203c' 
  AND token = 'vmvW4AhuQLDQ8qZcXECq8nuPe9y2tBIX1EVT0bP6EB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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