Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090dfb4f601b3424b034a99260932ed2fc0c878bfaef1f399ce9eed40ac2db5e' 
  AND token = 'OMVOQ6gAhN8sDmgxmdBTpiMsZe/zOkpOh8Uu3kOyQKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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