SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5eaf41839f4c91a584c4638c2a3db0a91586e264ab5548e859c7ea7a716061b4' 
  AND token = 'YK9hqUpfo6QBu1CEQ9FL/PyB18VvtFQzqueX89hNkPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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