Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d2c0c26016e8ed0cd800286b5713482e0fdfd0e25b54ab391de3ca25a973c3' 
  AND token = 'KNhtLvxeKipV6KOKiZzBheuzgPy5LG71+HciFwQlAr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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