Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3d52786c1c57a7f3486c8849efaf39bfd0855c9f99ee66aefbf9ef038f6634' 
  AND token = 'QQILnq4caeofmkAfHcaHwShXCu+nYi8r4OhUwrBAX54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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