Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446141069d24445d4781469c4e422e107662580776166013fcbca4838333361f' 
  AND token = 'bCdRVUTKeUFIPEPOf3Z+hbV81a3V5fAERhqkcwMVya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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