Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b81efa171715410dd69fa4f0e6e4c219df1600bbbfe1d3d890455e0e25d4ca07' 
  AND token = 'mvIQpffInWYueyCt+DmLPaovqz63SQten4N/xf0mRvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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