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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ceb6f4b39a405a6a43fa3559ad7255b00af18c714403a359080f731f2bcf334f' 
  AND token = 'iaUeNv2uxP3bvBIdQeD1eXd6sOWjpDSpwnXg208ZKQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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