Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81bc02cb26635ee59f797e310a810f2dc386f69816301e69d850b33b0651a279' 
  AND token = 'GokfDZ2ORHfNe0akCalYsqs1SV0I+5srXVfHo8v5xTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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