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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4e0f56d142814298c5fcd1187784b5e4b61ad18e8652dabd728a18588e44e8a2' 
  AND token = 'WViRAYSqOEF0t4qRKvVYc0ylrF6Yzkdqku3Vb8jUl64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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