Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd78e02266532c9680a2aece4d2cd9e5177a1e5f5e373ceb5cc37aec2d7f4840' 
  AND token = 'YbqSZnQZN9lSL6hnkuZBH9rR/RadDKDh6h9387sjmKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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