Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb45edefe4566b21d4f51b21c9090efbf1d002b42b687a59980ef8a61afe0bd' 
  AND token = '4/pADrt1mHJjoeKR+KbEqBoLSf5CoE5wQD8eHFKIVRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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