Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9021ed9aa129c4ada17185c03ca4ceacf836d2e6921a1454e48397db018c8f' 
  AND token = 'KqMaXQrkj21KYpEszcH8fElOA12h+h3+76gkoNhWXRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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