Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8846a9cb9211f68d27df8f1b48f7b9c9ee22835e1495939ec891f83d02b863c' 
  AND token = 'h/mMBz7hfJd0wzc9JNhGNTapCTp7gaGOCfdyU2yX0ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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