SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9965a7fdb44d6e5b80207e5011b1430b94cb44030732d31d524a984f25ec667e' 
  AND token = 'wD/CMh/dq+qcScSGbZibpzrit3/xWox8BtJrNGNiGCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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