Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5fc9947f70ddf796904241d34c2144e9d66ad333d0061ab49db618144f65a9' 
  AND token = '1kDXLG03NBLxvo8ho2DkeIqZPu58dbMOz0I5VjIHr0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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