Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73421abffc100cecfa19bd13895e1b12af11cbe85341df4f1c92508219ded5bf' 
  AND token = 'T4riNGuDoqbNjF2hwVA+qQ+NANgFwzkfAN+PLrrqdsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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