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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '52fa997ef63dd04f9a06fea6822f7a4a8658aa8882dca49a743c3ddd20ad421d' 
  AND token = 'YfMuc1MQZGMRlh9oolKBslkc61u4As0RaJc6I4yVI7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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