Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8e33dd6a900ccf8a08b907eecf9333c7bed67c4a22a14c54528f7c9bd66d419' 
  AND token = 'tx8Vsva2Br08nFS5kQ+8IBqOt+3bFzAPSU/fBsutvAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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