Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06cfdde59229110b75a1ce9c36e43906655473affce503e167f63efa4826c431' 
  AND token = 'fHk/GdcfXOp9FofhjMPuo66RjRRA0DjdnhdsMTDoQ3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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