Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcce3673c51a4e1abd8c0e9d4f264d4bc10304f56e0988afc213bb7ae4ae37a1' 
  AND token = 'wE8eUlPGIpOJ3ti0RV16slTXoVYlrX0fNwmSlHbu4CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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