Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ef8e80cf9294299b00f4bd8b5c9540af1aae8fffe9b14fe25d5234cc31bf62' 
  AND token = 'kiwYt8paRCls3CZwgZs+nKtE1lPRtoSvQgfzfYopq8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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