Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d958c03aaf0d3a3c3030f1ef71871725b504d4d74931c6f24b51b25870146b' 
  AND token = 'uslRWV4L/480RrdGue7KPUz2WTeGjWNkA7NZ6/AXBh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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