Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df83b4dfbb1021a6cf44dd0b3edc8e6c0d735688d22744a246b6219ec0c7cc0e' 
  AND token = 'umN6ENJu71Hpn95kbzbvVPs/v48pXzdNcWuUsZC40OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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