Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad72af3c9ea168996a06924cd740d61c38c27ea0e7f388e60fa36019ed37fe2' 
  AND token = 'MtgfUghT7qFe+Rob4eRCw8MviLdkmi0Ir8NUgSvAtn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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