Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf1c0f4018408d94d190fb6f6f8afc90ecad367c362b6baa7d6abf1e8452e8d' 
  AND token = 'Lu1JVjSIYHVobnmNSZtrw3aFl9vqpcfJkw042SPdDyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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