Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17685ff32b4a7a0a9897303effded68e0a8eaf032d6c1ba3ba669d7fb65db00d' 
  AND token = 'C8NrnlRWdQrCbJZ1nm0AjzXMnMtfQ1x3pOWI1d9Yvx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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