Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1ea62a86ca8dee87312e771c013779ea85bf4354a7f1608a5a0fd7e5886fd5' 
  AND token = '1fLYdbi3xVudUErEuruBlp8sTtoR+2nuX9Vz3MzZlAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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