Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b421fc819ca2ef7bdb0f7ddc485536e229b470cb28e7ba2b3629c90b62914263' 
  AND token = 'YjCNq7FCWJdc6hA+HorcggzC+NSiEHdE3vo9VFEJPkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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