Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156bc6349554ff00b5a7a16af6015ce01c84c2a6d59c8de48fb75a52cc41bcfc' 
  AND token = '4GcRKlXS1XDbP9dE8tRKJvA1WkN1iNB4h7z2KjxA1vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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