Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19908c79486e617de08f28215ef68756e77482bf9256887e095d8dbd37709f99' 
  AND token = 'FJi5BdtTW55XHrKzCU3zgdGX2ahNxvg29s9A8X9h37E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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