Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e25df4424beb66f69aadb970eee2d13888e64d7ef358e7960b814555475c3a9' 
  AND token = 'PmPtGcOnL2Tn6uK9oJrZdiumuYquNZbRhFUYrFaLHcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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