Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3248740c9d9c25f8cf36cecbff75399ed4db1bd023c9876dd574cff5fada83' 
  AND token = 'W7yVMaCvgCDm5lrppfL4XZuW71j5MhHY0jWVZ0wsebE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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