Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac4bd9f665de249058bb6fbcc101ea04191990eecfa7e422255faabe9af819f' 
  AND token = '/QlYqzL9yfT+urp+rIJCTXSxaN/z6hhWDIGucavzkBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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