Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8d2104af0c1bc95323023af8af3b61f1c2e817b0c0b6a1a6e565ae63943e4f' 
  AND token = 'JBmJLaaMrv6Y/KR9c1BkMOE1WrfPfP/98RrN0ljcJiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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