Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3ae0d29c11321f7251fcd9f793bdc6557ba8c03f868a3fcc27983f1baa6f331' 
  AND token = 'k4oxV04yItxEdK4bnweDjuPkbV4vphpUYqiC9t7yPiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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