SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5aba7b31b0aef8405f8bea9cc79dae63f61b4034d577ed61762ba8046b39ac5b' 
  AND token = 'YwEz0+03a950H0z4DwoKzRD/72YVrZOAYyFKtqHL6BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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