Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a3c39931da35f867729dad1701695c83fba34e271091c4885e44d6ef3b9ae3' 
  AND token = 'zRV+7Bx45WGxG8DzFr481VnyJAgCE//p7QOtwoegydM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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