Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827a1e13ab0defef6a4fc209e8fc9bcecc7505e30b7d84a49e8170127c1a813e' 
  AND token = 'EjotmU2pFowvzFBhbmZkmY5AGSpGkPl5QdIr0WDBrjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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