SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fc367f06bc7eb60d5612c34cbcfd11674af65bdd789712fb1dbb36a3f8ea1017' 
  AND token = 'h4Ml03K2/r7PGv2rooI+ZYxGzVm7xRoihrK0wOnzx1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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