Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc7bd65991a25c8c5d8bd6cea516ffcb07203311a8c5c83ebe75275e92147bd' 
  AND token = '4DS7y6vb0tT2GNqTqe0pyXMr2+K3Uf4ilrzo+sYfp0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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