Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538cf29dc7ebbd8b60dc098acf8360ac4e6b579e55efc08a2caab013f5a5b4a8' 
  AND token = 'wtw+4E6BO0VKQzD4K6XfPg9d+CUDM5j7bRbE5Qr2cPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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