Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4f928c2cf9188c4d2fc03672e565f5f6df8e47d3f6f993accdc3fbced42e6a' 
  AND token = 'Af6hQjmNNxOejmHOYgAvKVdpfGtlN2SHhW8hrsUKacQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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