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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '87b600c7693bc7901fe6faf81dd747d9b3c6a77461f4f95e1d38d235e2e71963' 
  AND token = 'MWmzbZEFDlUEU8NGRvilWILyBDe4APO8kpllbo4Nwck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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