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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '44e144451e16ebf02ad3a3e2100989613d54ae00e4e941126bb4286769925c98' 
  AND token = '5FxjHMh3otJhUZBBtEEpiqzG1w1XlWPW4762bldjSs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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