Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8caa73e189fb9fbedd41c08043aaa4dd518d161e011e327a99878f4602f964' 
  AND token = '9oR/mgtDEVk/tZa1yfs/weXeCOy5z6p62JyoCB9LJGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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