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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0ea91d39f8f430e8ab3498b4c18a789cac4ee0226653ce92b53dd47ab1604f72' 
  AND token = 'yqIp4sqLflu64hse692hNlJqKUGWa5d7Q/sFSMkvs/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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