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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4b3da76fb10b977d6359874f48c79192febed34f164b6c3707a176798222f155' 
  AND token = '0MeWp2/nrD7eoxuhfn/WEO3AQcoL6oM700g2PcRcWvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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