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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '48c98e52630ea478de5772e39d11eadf5981fc12a166cece21e667778a302d63' 
  AND token = 'S+N8smQTq82eMtX3xnez9tWceqP15IYaddzyFxh6l1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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