SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '162ce0bfd6b672522b7ff07df859de53de028081da1a2663b991549150f26b96' 
  AND token = 'eIv08ROhJS7R+IBYFeCFRfVGkKedDuQYt71LsY+LVgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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