Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c1aa9155f0ff10e51e1ad9551b16b6345832a774946bfc9293699caa83cb14' 
  AND token = 'or5W3CkiAybIqeCKJZOl4QtyM+iCYfGW4efRS9TgdAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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