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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1308120bc7edda342c65e22f1678ab2665ac9acb24076fdc96de9256247a51a2' 
  AND token = '/1AjfhdCsVxVtt6lH3DDZCpTcVLK3IXIVB2g1a8oWrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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