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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e9e22ddad50573bd53083f6844df17194b673d6f726dce5e91bdc2aff1e341ba' 
  AND token = 'ObqhLKIQNd9c0IApdMDZuo6+CmxEkMWlYEBBadehNxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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