Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221f91fe4fc76940910851e37bc4e83f26bbedaa5075c397c238a8043f1106ff' 
  AND token = 'O2LoBbH88cOZFcC9KUe+0ejZHf4tj9yi7CfowOQeYos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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