Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35683431d145796bd75626af0a98c84479c38e4092feb9d22cd5f4b0059bcf2d' 
  AND token = 'eRSdbUZMhomvFlGG/fiI2b3XOZ8slMibNpC615y7cq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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