Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdaee75ce2e80ca5643522957ce96657b7aaa3dcf20ec441458e95c825616bb2' 
  AND token = '0Z+U9cFWTBuv3Dwd9ZxVeCBsBVK0Q6VJsiKBKEiP2L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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