Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a8e2387e287c1e3249889dfc803bd5b972f67e4c5849959ab6cd924ce906b3f' 
  AND token = 'PK+Be6bM6xK65bF4bLWXw5DMFwkc8kcEJpPHSrzES3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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