Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '355b62dbb2aca1c58ceaa68c4125763e99638b8c1f5d19752a39f22eb81c4616' 
  AND token = 'rCq71BwAgYbp52iwI1BnAmJiAYPB+eSs3Q8OS8SnBIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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