Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a47f64430fbb53742b0c3b557a243a752a3cceca206b77be9e40782df7fb5af' 
  AND token = 'MLmkyaa0pPky+ucGPHweuDTT5N503VJcYs61l9xpQvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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