Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b4e24a8d3e7a6f2302d79f946e7058db02b7d2c979a42516c6bc20b9cf68ee' 
  AND token = 'kbAUL1ymdwiEJqZpjF+h4ScT96t15h9HNEQLFSYHcXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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