Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a20638c87f230136fe625af88254ae03e4d493837e23f8dbad983e0485277a0' 
  AND token = '4xQut9bHKkZpyu2Jx75A977OjMBYlWlQ+gMJJbtV83g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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