Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b1d0666ebf912fc8db24456fb7f684c7bc65bacc915bbcfc3c0d8f3f22b13c' 
  AND token = 'YUQV8X+UKyaLdbHrKdRBTgHYgAkXr2/uN84ipDFIg6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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