Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cffc14d9dd0ac38c631c042385d8068f2bd857cfbd3cf4aa1698dc6951335a7' 
  AND token = 'qhjnQv1ihY4Jo1OClO5OR1WUpfB9UXwf62pMvsBEgoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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