Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593bf144d7e3e81ab1e27720b709d4cf718ea40574f03506e93df9c2c14f7c66' 
  AND token = 'MP0UR8xpqHpb69aN3rgk9K1i4BG23BRqecN4H0zOQ80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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