Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec35ba51fe976fc156f4337f3ebbd20fb9770a1ba38d033e949be3d5b778ef43' 
  AND token = 'X7x7B1XrcZIsIvdg4qDatb6jsRjlNX/2UtGuaUFu1cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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