Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7948af5720358f602ec22df3635dc70ac039d1f2f1335cb6885be2622a07f255' 
  AND token = 'H8zBHR4keJam2NEwytq9lk116JY6IkVAj9bvoezW7qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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