Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bd57290e4c55ed04742bef2a2dd0e78edd91ed92de669a352736b287d2e534' 
  AND token = 'Vj36gEbt7nSCy4PTthZRmkr15ulS8YDIu+Dnlb0XjeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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