SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '825765420586d6db6ee6ce43e2d642d9480ba73fd5cb3391a4628cf063c101e3' 
  AND token = 'GfhldrkGGW7eW4KAakSOVD7JgUVwlHeWHKxrqos+D/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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