Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b7a129f1de727c53c693965a13488d39d356a45e7f221ee952ca8ee514719d' 
  AND token = '/B7ZXggd2FaNmdHpdyxb4uka62ALb7C2VU84Uf5mS+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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