Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6d176650a5db28dec6a2707cd2203da33ff813edbe291611c679de85eeb329' 
  AND token = 'hYMjiTQgmru+yhWLdvpeLy27aQnQmSy5xKwxZUt5+/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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