Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d80b04e48fbcd405f69be9be8eab2fe8f9904ff655686a749ebf2ad9382d227' 
  AND token = '/nl8wSImk9kxsFLf1j/Jqje/UZexnQDaD4Jm6MRHQuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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