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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '628951fe0230e54ab34256b70cb5a4bfc8e0d01018ef4ddc08f28021ecf6aece' 
  AND token = 'YnqB0CBzQLWvsNgq9wa8bRw0pzM4Wq+MEXwOU5DJDoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00233

JSON explain

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