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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '367aa7cdcf957b126e8deaa09f962a2553bc438a56c83afc934a9609e94ba623' 
  AND token = 'egtNRGD7qdkHSkAa3zQ7dtRRqhB0AvZ9B9m6LFPJcNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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