Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7936bb9524deb23594712796bbff547b7021b468434d18be5e75dfed82250df' 
  AND token = 'G/QIZh50J6EvLOc+krMtSn0hBdefZ2YTP/2d3XoP2ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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