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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9ec1bb84645a63c26c228308ce408d5e875b596c7aa3e0af2f465cac53a25896' 
  AND token = 'XRuVWIDZ9ZEIY0JdNLMq8GrkRTn3u2dJHBu3akjF/6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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