Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12c58cfa43cc898b084eaba90a4352e3557198b7ddd5c26a48e55ce7221a5bea' 
  AND token = 'hF/f0Wm5yzI2siPb6B0lTj0I6yBuqtdR2N9NlvajGMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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