Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257bc81e88f98620735623c6ab9e578644ce4396ffedc1669e711429aeacd125' 
  AND token = 'eIxAaJSRCdFci8Nf0Jxevbs24CiRJgVl1kHdegKBsEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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