SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3d3a690107427a2d49a6a168315c06fa2682c3b07631a8db5e7f02a7cffd753a' 
  AND token = 'P/CZlsTr+qKHZlLg9fjT/HrJa3had4z0w2inhPiNrqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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