Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2c9d8df5e80513e81bc0094bf1f478bf57a4d76a822f8ba49af8f2d0bc7187' 
  AND token = 'cRfvHo6brClyqXVnI7ydQ7bdfBl2KeuLEKty31YCWi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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