Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262c78b8daf339d54823b00cb1d850a5c8fb66bc36db949676d75a4a4115bc4a' 
  AND token = 'cPOjVSIBbIJkbT777avyRMI/BVdeK0ah6DLZf7xKopY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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