Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c8b39b0f25a5902e29a14b3728f734c9172a3c99442face5070b73f6885fc3' 
  AND token = 'Rc9RCWlYQ77a2dNLRPqtZNqdG2tV/sDH3SLYMFUuVhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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