Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c45bf18e6d26e83f94eb053f7d8072124861884cf359e8b051ad963e754b264' 
  AND token = '1RN/7zn5ZYRTa7RbRmMmarkFQ/vQ7Ed4gj1xkSQErqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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