Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6856948178ce6c33c424b454e672636e16b10d2be135728c6c01032bac8fd7' 
  AND token = 'gbO443gNxVO1wrAVk99zCdQEQsBDu01uYDvTKuOPVss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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