Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc0b3e9cf916ca51c7ad98d44b6523b8f49b43b2b642fbe92d459421c7b6cc6' 
  AND token = 'PPW/DXOGoSoztIBfRPdauqt2ju/E20UO745lBl2yaGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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