Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb51f5387964fdd23fd3da63964bd39d4811f7885b42fe55ae0f257be987c268' 
  AND token = 'f6TTgORTedFXabzFLnrkwkU5GPT5QBpEVJbxssbTfGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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