Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef1c98bbfbcd3676282c46ce4e88d846c4033da152afbf8a741c6cf9d67f8ea' 
  AND token = '+Hjzu41Ys4GoiQgRgXsndtcnG8VwIC1WQgs1vUsJzM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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