Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d2ed615571528098b73eb69f80b612a916a113c62c7e9565ad69f83ace2943' 
  AND token = 'eHtndHQAFx4SD+dLz3oZabDiHanqGdlh+6naECAWXEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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