Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38adf2dab9575276a0d10df5d4c797ba6766d9d41b176ad8664392737c54048' 
  AND token = '9jePKCSQK67TbXMhB145ohDjam/e6fuSnK9gwXJXePc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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