Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a391033e44d680a0b4de7e9cec5fc67ebdd6f756daeca59051ec1980a5ff179' 
  AND token = 'XB1gr/lZ+bhJN6CjWAV0HiVIOYLbAQ/Kd9rL93F8Df4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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