Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3993087b2f7f4fd3c74a530dd69c51ceb9a50733e453fce707ef565d213dc2e1' 
  AND token = 'f3ylIp7El0pxDhGp+okyrTE4rUYRsS2/Ltu5eBZB+xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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