Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546132bd7c4ee508aa8b703599e5caddbcee3147e26c7556893f5bf9f7a46459' 
  AND token = '24acGNZjwrPwTK4qQUW+9qw5HoLas1tqie588T34peQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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