Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8fd5846bdc58a3104309ef6588f74f2b16dbd5eec86577fcd9bbb110d4f6fb' 
  AND token = 'HqdscLze57cuZEMVtqv2McyIp22aqJnKZUDQ+JZSnVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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