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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7942e4542194b482560f0e3b8a93a1d62567c0cce2a92f43aeb1fd694aa78548' 
  AND token = 'RQXdxWquacx6IEF8MzH088+OagdBjfQeWzuglTJ9Odc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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