Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc57ec785ceefe6b72167e831f8098de4cd37132bdcb8ccad27f9a3fc6553f1d' 
  AND token = 'By2s7jTyP/O8VrRMs8cFgSPhI7/5SzW0q3Ectzhjp4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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