Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc9e68b3821c49e8f2d1ffa74ecf0a2988a8335166268c9693c9525647c1952' 
  AND token = 'Fh0IwMLiZc8UXkwcpjOrft5F4eFU8ySS43G7OYQVxi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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