Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e3c2d2a4b79fbed12e8ffe549eb9aea82d7b2d033356ee693abecc9515736' 
  AND token = 'xJtqw1NEDacTNH83lJApnvDr2GdaV5/u4De2KMcHmHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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