Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d31c082a0b00be451b847331ad3ee39a40fdea0424971e9fed4b0dc5905248' 
  AND token = 'IqUFmkyrGF7UOYlQgbvxWlZxyCf02iNybkSDHfWHNrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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