Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4e2f5db9c08fddf2b570a157e64476b8ba7aa3bf63c3b5a5728c4a9d6d63f325' 
  AND token = 'RpU5/to+d4UjTEI4rwiNpFcgAbcXjYTmtpLGPREjsTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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