Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad781150bb5c17baf2f343c7a3cf61f06991771b9dfa9bd249ea497c4b6a1b6' 
  AND token = 'ZbuiWtnUgsSeVH98QcbWghq/5XRyo4DLF1wZeBtIflI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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